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Biomedical subjects

M Varela

Publications and source records attributed to M Varela.

67 records · Page 4Linked to original sources
PubMedDate not supplied

[Body image in patients with dentofacial deformities treated by maxillofacial surgery].

OBJECTIVE: Considerable controversies exist about the psychological impact of dentofacial deformities and the effects of treatment on body image. This research, which is a part of a longitudinal prospective study about a number of psychological aspects of adult patients with severe dentofacial deformities treated by orthognatic surgery, assesses the body image of a sample of patients before and after treatment. METHOD: Two subscales, general and facial-oclusal, of the modified Secord and Jourard test were used to evaluate body image of a sample of orthognatic surgery patients (N = 58). The questionnaires were completed at four time points: one week before surgery (T0), and one (T1), six (T6) and twelve months (T12) after surgery. RESULTS: Despite the severity of dentofacial deformity, presurgical mean scores of both subscales of body image test were normal. T6 scores were significantly higher than normative levels in both subscales (p < 0.001). T6 scores were also significantly higher than T0 in both general (p < 0.05) and facial-oclusal subscales (p < 0.001). T12 measurements showed significant differences in both subscales with respect to normative levels but significant differences between T12 and T0 were only found in facial oclusal subscale (p < 0.001). No differences were found between T12 and T6 scores. CONCLUSION: The positive effect of orthognatic surgery on body image is encouraging, but longer follow up is needed to evaluate the persistence of results and the eventual occurrence of any late change.

Adolescent↗
PubMedDate not supplied

[Chronic hemodialysis in children].

The clinical features of eight patients, four females, aged 4 to 15 years under chronic hemodialysis for terminal renal failure (creatinine clearance 10 ml.min.1,73 m2 or less) are reported. Initial diseases were Alport syndrome, systemic lupus erythematosus, chronic glomerulonephritis (n = 2), bilateral polycystic kidney, prune belly syndrome and reflux nephropathy (n = 2). Distal vascular approach by means of arteriovenous fistulas was preferred for these patients and the kinetic urea model was used to evaluate the performance of the procedure. Patients required nine to twelve hours of hemodialysis per week for optimal results. Mean weight decreases of 1 to 3 kg and reductions in blood urea nitrogen and serum potassium of 40 mg.dl and 2,5 mEq.1, respectively, were observed. The main complications of hemodialysis were the disequilibrium syndrome, infections at the site of insertion of the arteriovenous fistulae and congestive heart failure. Three patients were submitted to renal transplantation with live donors homografts: one died and the other two remain alive but under chronic hemodialysis. Five children are attending school regularly, and two of them are waiting a kidney donor for transplantation. Despite encouraging results chronic hemodialysis in children constitutes only primary supportive therapy prior to renal transplantation.

Adolescent↗
PubMedDate not supplied

[Hemolytic-uremic syndrome. Experience with 154 cases].

One hundred and fifty four patients with hemolytic uremic syndrome (HUS) were admitted from year 1968 throughout 1989 to a public children's hospital (n = 139) and to a private general clinic (n = 15) at Metropolitan Santiago, Chile. Their mean age at admission was 16 months, 64% of them were 6 to 18 month old. One third of patients were admitted at spring season. The prodromal phase lasted between 1 and 19 days. In 92% of cases there was antecedent diarrhea and 31% showed neurological involvement. Anuria was present in 44 patients (21%) lasting an average of 7 days; sixty one affected children (40%) became hypertensive. Sixty patients (39%) underwent peritoneal dialysis, remaining cases were given maintenance treatment for acute renal failure (ARF). No specific treatment was used except heparin in 5 children along the first years of these series. Ten patients (6%) died during the acute phase of their disease, but death occurred in only 2 of the 76 most recent cases, probably because of more accurate diagnosis and greater experience of the professional team in the management of ARF, even though very heterogeneous clinical presentations were observed along the whole observation period. Three patients developed chronic renal failure.

Acute Kidney Injury↗
PubMedDate not supplied

A circannual rhythm in cysts formation and growth rates in the dinoflagellate Scripsiella trochoidea Stein.

The percentages of formed cysts and growth rates were monthly estimated and analyzed rhythmometrically by cosinor for 5 clonal cultures of Scripsiella trochoidea Stein grown for 2 years under laboratory conditions, rended as constant as possible from the view point of environmental temperature (24 +/- 1 degree C), lighting (25 microEin m-2 s-1), and artificial seawater. A circannual rhythm is macroscopically apparent and microscopically (by cosinor) validated for 3 of 5 clones. The data of the other 2 clones did not allow rhythm detecting by the method used, suggesting differences in spectral structure of S. trochoidea strains both in terms of cyst formation and growth rate rhythms.

Animals↗
PubMedDate not supplied

Evidence of an endogenous circannual rhythm in growth-rates in dinoflagellates.

Prorocentrum micans and Gonyaulax excavata clonal cultures grown under constant laboratory environmental conditions (continuous light and 20 +/- 1 degree C), over a two-year period, exhibit significative changes in growth rate. When rhythmometrically analyzed by cosinor, a pattern resembling a circannual rhythm became apparent. Significant rhythmometric differences appeared between species. Endogenous rhythms of microorganisms may have ecological implications.

Animals↗